Eaton Vickers 25M High Speed Vane Motor

The Eaton Vickers 25M Series is a high-performance, fixed displacement vane motor designed for applications requiring high rotational speeds and reliable starting torque. Part of the legendary M-Series, the 25M features a hydraulically balanced cartridge design that extends bearing life and allows for smooth operation even at speeds up to 4000 rpm. It is the industry standard for driving cooling fans, winches, and swing drives in mobile and industrial equipment.

Key Features:

Series: 25M (Standard) / 26M (Heavy Duty Bearing)
Torque Ratings: 42, 55, 65 (lb.in./100 psi)
Max. Speed: 3600 rpm (Cont.) / 4000 rpm (Intermit.)
Max. Pressure: Up to 172 bar (2500 psi).

Product Overview The Vickers 25M Vane Motor converts hydraulic pressure into rotary mechanical power with exceptional efficiency. Its “Dual Pressure Plate” design ensures optimal internal sealing, reducing leakage and maintaining high volumetric efficiency throughout the motor’s life. The motor utilizes a cartridge kit concept, meaning the entire rotating group can be replaced in minutes without removing the motor from the machine, minimizing downtime.

Why Choose Vickers 25M?

High Speed Capability: Optimized for high-speed operation (up to 4000 rpm), making it perfect for driving fans and compressors where piston motors might be limited.
Hydraulic Balance: The inlet and outlet pressure chambers are diametrically opposed, canceling out radial loads on the shaft. This allows the bearings to focus solely on the external drive load, ensuring longevity.
High Starting Torque: The dual-lip vane design ensures positive vane contact at startup, providing high breakaway torque essential for hoisting and winch applications.
Low Noise: Smooth vane interaction reduces pulsation and operating noise.

Common Applications:

Fan Drives: Cooling fans on construction equipment and buses.
Winches: Marine and forestry winches.
Swing Drives: Crane and excavator swing functions.
Industrial: Conveyor drives, Mixer drives.

Specification	Value / Description
Product Type	High Speed Vane Motor
Series	25M (Standard Bearing) 26M (Heavy Duty Bearing)
Torque Ratings (lb.in / 100 psi)	42: ~4.7 Nm / 6.9 bar 55: ~6.2 Nm / 6.9 bar 65: ~7.3 Nm / 6.9 bar
Displacement ( $V_g$ )	42: 43.9 cm³/rev (2.68 in³/rev) 55: 57.7 cm³/rev (3.52 in³/rev) 65: 68.7 cm³/rev (4.19 in³/rev)
Max. Pressure	155 bar (2250 psi) Continuous 172 bar (2500 psi) Intermittent
Max. Speed ( $n$ )	3600 rpm (Continuous) / 4000 rpm (Intermittent @ low pressure)
Mounting Flange	SAE 2-Bolt (Standard)
Shaft Options	Keyed (No. 1), Splined (No. 11)
Port Connections	SAE 4-Bolt Flange or Straight Thread
Common Part Numbers	Model Code: 25M-[Torque]-[Mount]-[Shaft]-[Port]-[Design]-[Rot] 25M42A-1C-20 (42 Torque, Keyed Shaft, C Ports) 25M55A-11C-20 (55 Torque, Splined Shaft) 25M65A-1C-20 (65 Torque, Keyed Shaft) 26M55A-1C-20 (Heavy Duty Version) Note on Suffix: -114: CCW rotation (2500 psi max) -124: Bi-directional rotation (2500 psi max)